Hugo in Docker image, packed with Alpine Lunux

Dockerfile

FROM alpine:latest

# ARG PACKAGE="hugo_extended"
ARG PACKAGE="hugo"
ARG REPOSITORY="gohugoio/hugo"
ARG VERSION="0.58.2"

WORKDIR /opt

# Install dependencies (bash, curl and jq for parsing Github)
RUN apk update \
    && apk add --no-cache --virtual build-dependencies curl \
    && curl -O -L https://github.com/gohugoio/hugo/releases/download/v${VERSION}/${PACKAGE}_${VERSION}_Linux-64bit.tar.gz \
    && tar -zxvf ${PACKAGE}_${VERSION}_Linux-64bit.tar.gz hugo \
    && rm ${PACKAGE}_${VERSION}_Linux-64bit.tar.gz \
    && ln -s /opt/hugo /usr/bin/hugo \
    && apk del build-dependencies

CMD ["hugo"]

hugo.sh

#!/bin/bash

# Constants
REPOSITORY="gohugoio/hugo"
OS="Linux"
ARCH="32bit"

API_RELEASES_URL="https://api.github.com/repos/"${REPOSITORY}"/releases" 
if [[ $VERSION == "latest" ]] 
then 
    API_RELEASES_URL=$API_RELEASES_URL"/latest" ; 
fi  
echo "API Release URL: "$API_RELEASES_URL
PAGE_CONTENT=$(curl -s $API_RELEASES_URL) 
if [[ $VERSION == "latest" ]]  
then 
    JQ_SELECTOR_LATEST_TAG='.tag_name'
    ACTUAL_VERSION=$(echo $PAGE_CONTENT | jq $JQ_SELECTOR_LATEST_TAG  | tr -d '"v' ) 
else
    ACTUAL_VERSION=$(echo $VERSION | tr -d '"v')
fi 
echo "Requested version is: "${ACTUAL_VERSION} 
if [[ $OS == "Windows" ]]  
then 
    EXT="zip"
else
    EXT="tar.gz"
fi 
ARCHIVE_NAME="hugo_"$ACTUAL_VERSION"_"$OS"-"$ARCH"."$EXT 
echo "Archive name is: "${ARCHIVE_NAME}
if [[ $VERSION == "latest" ]]  
then 
    JQ_SELECTOR_LATEST='.assets [] .browser_download_url | select(endswith("'$ARCHIVE_NAME'"))'
    DOWNLOAD_LINK=$(echo $PAGE_CONTENT | jq -r "$JQ_SELECTOR_LATEST"  | tr -d '"' ) 
else
    JQ_SELECTOR_ALL='.[] .assets [] .browser_download_url | select(endswith("'$ARCHIVE_NAME'"))'
    DOWNLOAD_LINK=$(echo $PAGE_CONTENT | jq -r "$JQ_SELECTOR_ALL"  | tr -d '"' ) 
fi 
echo "Downloading latest release from "$DOWNLOAD_LINK 
cd /usr/local/hugo
curl -L $DOWNLOAD_LINK -o $ARCHIVE_NAME 
tar xzf /usr/local/hugo/${ARCHIVE_NAME} -C /usr/local/hugo/